Chuck.



A. M. CAMPBELL.

CHUCK.

APPLICATION FILED APR. 16, I917.

Patented May 7,1918.

ACHESON M. CAMPBELL, OT PORT ROBIITSON, GNTARIO, CANADA.

CHUCK.

Specification of Letters Patent.

Patented lhlay "a, rats.

Application filed April is, 1917. Serial No. 162,565.

To all whom'z't may concern:

Be it knownthat I, Aounson Mnaonnn CAMPBELL, a subject of the King ofGreat Britain, and resident of Port Robinson, in the Province ofOntario, Dominion of Canada, have invented certain new and usefulImprovements in Chucks, and do hereby declare that the following is afull, clear, and exact description of the same, such as will enablethose skilled in the art to which it appertains to make and use thesame.

This invention relates to improvements in chucks particularly adaptedfor the use on lathes and the objects of the invention are to facilitatein automatically centering and driving a shell or other piece of work inthe chuck, to permit of the chuck being readily assembled, to simplifythe construction and generally to adapt the several parts to betterperform the functions required. of them, and it consists essentially ofthe improved construction particularly described and set forth in thefollowing specifications and accompanying drawings forming part of thesame.

In the draW1ngs- Figure 1 1s a perspective west of the im- .provedchuck.

2- is a longitudinal section of the same.

Fig. 3 is a longitudinal section of an alternative form of the chuck.

Fig. i: is a fragmentary end elevation of the nut and coacting handwheel with the cover plate removed.

Like characters of reference refer to like parts in the several figures.

Referring to the drawing, A represents a lathe of any usual descriptioncomprising the head 10 rotatably supporting the driving spindle 11. Thisspindle makes threaded engagement with the orifice 12 provided on theinner end of the body portion 13-of the chuck, which body portion in theembodiment illustrated is recessed so that it will conform to the outerperiphery of a shell the forward end of the body portion being formedwith or Without a reduced conical portion 14- and being threaded asshown at 15.

The threaded end of the body portion is adapted to engage with the nut16 which is only threaded partially therethrough and is formed with areduced parallel. Wall 17 at the front connected to the threaded portionof the nut by the conical wall 18, the said nut being provided at thefront with peripheral recesses 9, the object of which will be made clearhereafter.

A hand wheel. 19 is rotatably mounted on the nut 16 which in turn may ormay not be rotatably mounted in the bracket 20 carried by the bed 21 ofth lathe. This hand wheel is provided with projections 8 on its innerthe end Walls thereof. The hand Wheel is retained in its operativeposition by the cover plate 6 secured to the nut 16.

Slidably mounted within. the conical Wall 18 is a split conical ringdesigned to coact with the conical portion i l of the body 13, so thatwhen the nut 16 is tightened on the said body portion, the ring will beforced into engagement with the outer periphery of a shell or otherpiece of work placed in the chuck, and will result in the automaticcentering and gripping of the work.

In Fig. 3 the chuck is somewhat modified, the hand wheel 19being'located at the rear end of the nut16 and engaging therewith in themanner above disclosed, being held in position by the cover plate 6secured to the rear face of the nut.

The outer face of the nut is also provided with a beading 2 f embracedby the guard carried by the bracket 20, which guard is provided at thelower end with a drain pipe 26 by means of which the lubricant orcooling liquid used in turning or on the chuck may be carried off.

The assembly of the chuck will be readily understood from the foregoingdescription.

When the chuck is in use, a shell is placed in the hollow body portion13 whereupon the hand wheel 19 is quickly rotated, and the projections 8impacting on the end walls of the recesses 9 tighten the nut 16 anddrive the split ring into engagement with the outer periphery of theshell automatically centering the same, when the boring or otheroperation may be commenced.

In removing the shell it is only necessary to rotate the hand wheel 19in the opposite direction to that when tightening the nut, whereupon theprojections 8 will impact on the end walls of the recesses 9 in the nutWhich will consequently become loosened and permit of the shell or otherwork being withdrawn from. the chuck.

As many changes could be made in the above construction and manyapparently widely difi'erent embodiments of my invenperiphery designedto engage with; the recesses 9 in the nut and to coast with tion, withinthe scope of the claims, constructed without departing from the spirltor scope thereof, it is intended that all matter contained in theaccompanying specification and drawing shall be interpreted asillustrative and not in a limiting sense.

What I claim as my invention is: 1. A chuck of the class describedcomprising a body portion having a threaded orifice in one end thereof,a reduced conical portion on the opposite end of the body, a nut makingthreaded engagement with the body portion and provided with a taperingwall of the nut, means for rotating the nut, and

1 means for draining off lubricant from the chuck. 2. A chuck of theclass described comprising a body portion, a nut making threadedengagement therewith, a split resilient conical ring engaging with thenut, a bracket rotatably supporting the nut, and a guard on the frameencircling the outer end of the nut and provided with an overflow.

3. A chuck of the class described comprising a body portion, a nutmaking threaded engagement with the body portion and rovided withperipheral recesses, a hand w we] provided with projections designed tocoact with the end walls of the recesses, and means located in the bodyportion adapted to cngage with the outer periphery of the work securedin the chuck when the hand wheel has been rotated.

In testimony whereof I have signed at Port Robinson,Ont. V

AGHESON M. CAMPBELL. In the presence of H. PARK.

Copies of this patent ma be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. G.

